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a in (-oo:+oo)
(3/5)*a = 1/4 // - 1/4
(3/5)*a-(1/4) = 0
(3/5)*a-1/4 = 0
3/5*a-1/4 = 0 // + 1/4
3/5*a = 1/4 // : 3/5
a = 1/4/3/5
a = 5/12
a = 5/12
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